Talking machine



Nov. 1, 1932. J. DIEUX 1,885,994

TALKING MACHINE Filed Aug. 6. 1929 2 Sheets-Sheet 1 Z?" Ff f p22 32 g- 6 'K O Z4- 3a 4 L, 72 l l] 7 f i 7 l M f P l'1,385,994 n f Nov. 1, 1932. J. DIEUX TALKING MACHINE Filed Aug. 6, 1929 2 Sheets-Sheet 2 Patented Nev. 1. 1932 JEAN nmux, or mais, FRANCE PATENT oFFlcs TALKING MACHINE Application filed August 6, 1929, Serial N o. 383,868, and in France January 4, 1929.

The primary object ofthe present invention is to provide an im roved quality of sound emission from a ta 'ng machine.

A further object is to reduce toa minimum the noises caused by the friction ofthe vneedle on t-he record surface.

A further object is to obtain automatic starting and stopping of a talking-machine.

A still further object is to produce a device which would enable the stylus point to be A moved at an approximately constant angle in relation to the record surface, which, in

instances where these record surfaces are constituted as disc records, would render it possible for the diameters of these discs to be made as large as desired.

A preferred form of the invention is shown, by way of illustration, in the accompanying drawings, in which :-V

Fig. 1 is a diagrammatic plan of a device embodying the invention applied to an electrically-driven talking-machine;

Fig. 2 is a view mainly in perspective of thisdevice; and

Figs. 3, 4 and 5 are explanatory diagrams.

(For convenience in reading the drawings, the mechanism is shown outside the casing 100 of the talking-machine, but in reality this mechanism is preferably enclosed in said casing, with the exception of the pick-up 8 and of the arm 1, 12.)

The talking-,machine arm is made up'of two vcrossing members 1, 12 which are hin ed at their extremities 2', 221:0 lugs secure to a hub 4. Hub 4 is itselt mounted upon a pin 5 fixed to the supporting cap 6, so that the hub can revolve about the vertical axis P.

The other ends of members l and 12 are connected by ball and socket joints 7 and 7 2, to

the casing 8 of the pick-up. In the interior of the pick-up is shown an electro-'magnet 9,

movable armature 10 and stylus 11, this latter being a needle, a sapphire or a diamond,

for example. Member -12 is sha d as shown 5 at 12 at the crossing of the mem ers 1 and 12 so that they can move freely in relation to one another.

The supportingcap 6 carrying the pivot pin 5 can bedisplaced in a ixed and suitably 0o disposed slot 21. The latter is usually provided in the upper portion of the casing containing the driving mechanism of the talking machine. i

The hub 4 carries an arm 22 which turns t0- gether with the hub about the pivot pin 5. To arm 22 is pivoted one end of a connecting rod 23.

A diagonally disposed member 25 is pivotally mounted at one of its ends on a fixed' pivot pin 51 provided in the box of the talking machine. The other end of said member 25 is linked to the free end of the 'connecting rod 23. Intermediate its ends, the member is provided with a longitudinal guide slot A second member shown at 24 is pivotally mounted with its one end on the movable pivot pin 5, while the other 'end of member 24 is pivoted on a fixed pivot pin provided in the box of the talking machine. Intermediate itslends, the member 24 carries a thumb screw 26 adapted to slide in the guide-slot 27 of member 25 and to engage said member.

The device shown on the attached drawings also includes a switch means actuated by crossing members 24 and 25. The circuit of the motor M and of the amplifier A, which i are fed from a source of supply indicated by S, includes the switches I and I2 each consisting, for instance, of a lever 40 pivotally mounted at 41 and arranged to engage fixed contact 42.

The operation of this device is as follows The group composed of the hub 4, pivots 2 v and 22, crossing members 1 and 1g and the 5;, casing 8 ofthe pick-up form a parallelogram abcd (Fig. 3) which is deformable, the centre of side cd rotating about the pin Pin a plane approximately parallel to the plane of the record surface 13. In these conditions, as the angles made by ac and bd'with ab and cd, and in similar manner, the angle between ab and dotted line R, can be varied,there is nothing to prevent the angle between ab and S, i. e. the angle of incidence of the record 95 grooves, from remaining constant provided the lengths of ab, cd, ad and bc' as well as the position of P on cd' are suitablI chosen. The diagram of Fig. 4 shows, in act, that the angle Rab is variable while the ,angle Sab 100 sivotin is constant with a deformable pivoting arm in a plane parallel with the record surface 13.

It should also be noted that the sides a0 and bd of the dia ammatic parallelogram can be-eliminated lig. 5) and replaced by the diagonals bc and ad hinged at their ends and thus forming a deformable X, which ensures the deformation of the parallelogram abcd in the plane parallel with the record surface as explained above.

On the other hand, when the stylus 11 of the pick-up moves in a groove of the record surface, it carries with it the deformable X arm 1 lz which rotates on the pivot P in the direction of arrow 30 (Fig. 1) pivot P carries lever 22 in the same direction; and lever 22, operating on connecting rod 23 rotates member 25 about its fixed pin 51 in the direction of the arrow 31 (Fig. 1). In its rotation, arm 25, acting through grub screw 26 and slot 27, causes arm 24 to rotate in the direction of the arrow 32 (Fig. 1), thus causing pivot P to slide along slot 21 in the same direction, arrow 32.

This arrangement therefore clearly allows the pivoting arms l', 1z to present the diaphragm or pick-up 8 at an approximately constant angle with the grooves of the record surface, the angle between the diaphragm or pick-up and the pivoting radius varying. By radius is meant the straight line rawn rom the center of the pick-up 8 to the center of the pivot P.

On the other hand, automatic starting and stopping of the talking machine is ensured by the switches I', I. The free end of the levers 40 of the switches I', Iz are actuated by arm 1.-to close the circuit by releasing the lever 40 of switch I when the pivoting arm 20 is in its starting position, whereby motor M and amplifier A are connected in;

2.-to break this circuit by acting on lever 40 of switch I2 when the pick-up reaches the end of its travel, whereby motor M and amv plier A are cut out. l

What I claim as my invention and desire to secure by Letters Patent is 1. In a sound recording and reproducing4 machine, a casing, a

ooved record dis adapted torevolve in said casing, a pivot pin provided in said casing adjacent said disk,

a hub adapted to rotate about said pivot pin,l

two crossing members forming an X 1n, a plane substantially parallel to said disk and each pivotally connected with one end to said hub, a pick-u pivotally carried on the other ends of sai vided on said' pick-up so as to rest in a. oove of said disk in engagement with the atei-al face of the groove, whereby the position of -said pick-up and the? deformation of said crossing members are determined.

2. In a sound recording and reproducin machine, a casing, a groovedrecording di members, a stylus pro' adapted to revolve in said casing, a pivot..

lateral face of the groove whereby the exact position of said pick-up and the deformation of said crossing members are determined, and means controlling the displacement of saidpivot pin in a plane parallel tov said disk thereby insuring the approximate position of said pick-up relative to said rooved disk.

3. n a sound recording and reproducing machine, a casing provided with a. guide, a grooved disk adapted to revolve in said casing, a pivot pin movably mounted in said guide, means controlling the displacement of said pivot pin in said guide in a plane parallel to said disk, a hub rotatably mounted on said pivot pin, two crossing members forming an X provided in a plane substantially parallel to said disk and each pivoted at one of its ends to said hub, a pick-up pivotally carried by the other ends of said members, anda stylus provided on said pick-up so as to restvin a groove of said disk in engagement with the lateral face of the groove.

4. In a sound recording and reproducing machine, a casing having a guide, a grooved record disk adapted to revolve in said casing, a pivot pin movably mounted in said guide, a hub rotatably carried by said pivot pin, a-first slotted member pivoted at one of its ends on said casing, a second member forming with said first member an X capable of being deformed in a plane ysubstantially parallel to the plane of said disk, said second member being pivoted at one of its ends to said'casing and connected at its other end with said pivot pin, a button carried by said second member and slidably mounted in the l slot of said first member, a link pivoted to said first member, a lever pivoted to said link and carried by said hub, two crossing members yforming an X in a plane substantially parallel to said disk and each pivoted at one of its endsto said hub, a pick-up pivotally 'carriedl by said crossing members, and

a stylus provided on said pick-up so as to rest in a groove of said disk in engagement with the lateral face of the groove, whereb the positioning of said pick-up and the de ormation of said crosslngV members are determined. v

In testimony whereof I have signed this specification.

Y JEANDIEUX. 

